Refresh find dialog ref list when reloading log list refs

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update libgit2

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Add certificate check dialog for unknown/self-signed certificates

Signed-off-by: Sven Strickroth <email@cs-ware.de>
Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Merge branch 'libgit2-certcheck'